DNA片段的平末端是任意连接的吗?

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1高考试题中平末端的连接1.1题目(2008年高考生物江苏卷第32题)将动物致病菌的抗原基因导入马铃薯制成植物疫苗,饲喂转基因马铃薯可使动物获得免疫力。以下是与植物疫苗制备过程相关的图和表。
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